Ferromagnetic Coupling in the Heterospin Bis-Catecholato–Manganese(IV)Complex with Pyridine Substituted by Nitronyl-nitroxide
作者： Michael P. Bubnov , Irina A. Teplova , Eugenia A. Kopylova , Konstantin A. Kozhanov , Artem S. Bogomyakov
DOI: 10.1021/ACS.INORGCHEM.6B02411
关键词: Radical 、 Manganese 、 Magnetic susceptibility 、 Pyridine 、 Chemistry 、 Octahedron 、 Inorganic chemistry 、 Nitroxide mediated radical polymerization 、 Crystallography 、 Intramolecular force 、 Molecule
摘要: A new bis(3,6-di-tert-butyl-catecholato)manganese complex with two 4-NIT-Py ligands was synthesized and characterized [4-NIT-Py = pyridine substituted at position 4 nitronyl-nitroxide radical, 2-(pyridin-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl]. X-ray diffraction indicated an octahedral environment of the manganese atom a trans arrangement ligands. Bonds lengths in inner coordination core metal chelate cycles that are representative charge distribution between displayed Mn(IV)(Cat2–)2 distribution. Variable-temperature magnetic susceptibility measurements detected intramolecular ferromagnetic coupling Mn(IV) S 3/2 spins nitronyl-nitroxyls intermolecular interactions adjacent fragments chain molecules low temperatures. The last phenomenon is revealed by short contacts radicals ...
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